Benzoyl-3-methyl-1-phenyl-6pyrazolone(BMPP) is a chelating agent that has been used as an efficient extractive reagent for the isolation and separation1 of several elements. Jensen2~3 was the first to describe its synthesis and properties, and it has been investigated in more detail by many we described an atomic-absorption spectrophotometric method using BMPP as a chelating agent, and found that it is very useful for the extraction of many cations. Also, BMPP has been used for the spectrophotometric determination of vanadium(1V) and vanadium(V) in a vanadium catalyst having a silica m a t r i ~. ~ However, there have been few studies of the use of BMPP in the practical situations.BMPP reacts with vanadium(V) to give a red complex, which is extractable into chloroformbutan-1-01 (4 + 1) solvent mixture in the pH range 2.54.5. This paper describes the use of BMPP as a reagent for the selective spectrophotometric determination of vanadium(V). The method has been applied to the determination of vanadium in several steels. In previous Experimental Apparatus measurements.A Shimadzu QV50 spectrophotometer with a 1-cm silica cell was used for absorbance A Toa Denpa HM-5BS pH meter was used for pH measurements. ReagentsThe reagents used were of analytical-reagent grade. BMPP reagent solution. BMPP was synthesised according to an established method.2 Elemental analysis confirmed the synthesis (calculated for C,,H,,N,O,, C = 73.37, H = 5.07, N = 10.07 and 0 = 11.50%; found, C = 73.27, H = 4.91, N = 9.98 and 0 = 11.83%). A 0.1% m/V solution of BMPP was prepared by dissolving 0.1 g of BMPP in 100 cm3 of chloroformbutan-1-01 (4 + 1). This solution was prepared by dissolving 1.1489 g of ammonium metavanadate in 1 mol dm-3 sulphuric acid and diluting to 500 cm3 with distilled water.Acetic acid (0.1 M) was adjusted to pH 3.0 with 0.1 M sodium acetate s o h tion. Y a ~d i u m ( V ) standard solution, 1 mg ~m -~, Bufley solution, fiH 3.0.

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